Sharing a motorcycle works best when both riders have a say in the rhythm of the day.
An adventure motorcycle becomes useful through the journeys it makes. Upright ergonomics, space for a modest overnight bag and a comfortable pace can turn a familiar road network into a weekend worth remembering. The most interesting build is often the one that fits the rider's ordinary life.
Making the idea work
Before adding equipment, take the motorcycle on the sort of ride it will actually do. Notice how it feels at stops, how easily the bags open and whether the seating position stays comfortable. Those observations provide a clearer direction for the next journey than an elaborate list of modifications.